水-水交换器进、出水母管更换施工方案批准公司主管领导：审定设备部长：经营部长：审核技术分部：QHSE分部：校对编写专业：编写编写人员：文件包序号：*****本标准适用于：机组年级检修（内部资料注意保密）惠州LNG电厂390MW机组检修标准目录1工程概述······································································································12编制依据······································································································13管道材料······································································································14管沟开挖······································································································25防腐施工······································································································36管道安装工程································································································37管道水压试验································································································48管沟回填······································································································49质安健环措施································································································410劳动力组织··································································································511主要施工机具·······························································································51工程概述1.1设备简介惠州LNG电厂3×390MW燃气-蒸汽联合循环机组水-水交换器为茂名市港电力设备厂生产，型号BLQW-1-1230，共4台，壳程为闭式水，管侧为海水，传热面积为1230m³，效率99%。交换器海水进出口规格为PN6，DN600。2009年春节更换了4台水水交换器海水侧进、出水蝶阀，及进水门后、出水门前管道，规格DN600，材质316L。现拟在2012年春节公用系统检修期间更换4台水-水交换器进、出水母管（DN1020）、支管（DN600），材质316L。1.2改造原因由于惠州电厂闭冷水是母管制，4台水水交换器出力满足惠电3×390MW燃气-蒸汽联合循环机组需要，如果出现水水交换器进出水管漏海水，水水交换器无法运行，将影响全厂三台机组的运行，有可能造成全厂停机。水水交换器进排水管均是碳钢管，经过几年的运行，地下埋管和地面上管段都出现防腐脱落现象。2009年春节公共系统检修期间更换了4台水水交换器海水侧进、出水蝶阀，及进水门后、出水门前管道，地下管道未...
